XPS8930. Purchased early 2019. Lost audio, tried control panel and other obvious remedies and ended up rebooting. Upon start up got a funny (non-windows) screen saying that update or repair needed to be made and don't turn off the machine!

I may have panicked thinking I was hacked so I unplugged computer. Current status is when pushing power button I get a blue light for about 8 seconds before it starts flashing yellow in 3 flash bursts. No signal to monitor.